Claw

Claw, also called Talon , narrow, arched structure that curves downward from the end of a digit in birds, reptiles, many mammals, and some amphibians. It is a hardened (keratinized) modification of the epidermis. Claws may be adapted for scratching, clutching, digging, or climbing. By analogy, the appendages of other lower animals are frequently called claws. The claw’s shape is ordinarily suited to the food-getting habit of the animal. Eagles have long, curved talons for grasping prey; the claws of chickens are short and sturdy, for scratching the ground for food.

Cat claws.

Anasiz

Diagram of a cat’s claw.

Encyclopædia Britannica, Inc.

There are two mammalian modifications of the claw: the nail and the hoof. A nail is a broad, flat claw on the upper surface of the digit. It is present in mammals, such as primates, that use their appendages for grasping. A hoof is a short, thick structure that surrounds the end of the digit. It is present in various forms in the ungulates, which have a reduced number of digits. Hoofs are an adaptation for running.

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in the anatomy of humans and other primates, horny plate that grows on the back of each finger and toe at its outer end. It corresponds to the claw, hoof, or talon of other vertebrates. The nail is a platelike, keratinous, translucent structure that consists of highly specialized epithelial cells....

In many animals, hardened corneal growths occur at the end of the digits, growing parallel to the skin surface. True claws—found in reptiles, birds, and mammals—consist of a dorsal scalelike plate (unguis) covering a ventral plate (subunguis), the whole capping the bony tip of a digit. Nails—found only in mammals—consist of a broad and flattened unguis, with the...

...Panthera), especially the lion, often roar, growl, or shriek. Usually, however, cats are silent. Many cats use “clawing trees,” upon which they leave the marks of their claws as they stand and drag their front feet downward with the claws extended. Whether such behaviour is for the purpose of cleaning or sharpening the claws or simply to stretch is debatable, but...